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                  <p><small><a name="what_is_arc_format"></a>PeaZip
is a free cross-platform file archiver utility that provides an unified
portable GUI for many Open Source technologies like 7-Zip, FreeArc,
PAQ, UPX... free alternative to WinRar, WinZip </small><small>and
similar
proprietary software</small><small>.<br>
- Create 7Z, ARC, BZ2, GZ, *PAQ, PEA, QUAD/BALZ, TAR, UPX, WIM, XZ, ZIP
files<br>
- Open and extract ACE, ARJ, CAB, DMG, ISO, LHA,
RAR, UDF, ZIPX files and more,</small><small> over 200 archive types
supported</small><small><br>
Features of PeaZip includes: </small><small> </small><small>archives
opener and extractor, </small><small>read / write arc files, batch
creation and </small><small>extraction </small><small>of multiple
archives at once, </small><small>convert files, </small><small>create
self-extracting archives, split and join files,
strong encryption with two factor authentication, encrypted password
manager, </small><small>secure deletion, </small><small>find
duplicate files, </small><small>calculate hash and checksum,
export job definition as script.</small></p>
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            <td colspan="1" rowspan="1" style="vertical-align: top;"> <br>
            <h1 style="text-align: center;"><big><big><big><a
 name=".arc_extension"></a>What is ARC file format, FreeArc
archives</big></big></big></h1>
            <br>
            </td>
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                  <ul>
                    <li>
                      <p><a href="#arc_specifications">WHAT ARE ARC
FILES, FREEARC ARCHIVE FORMAT<br>
                      </a></p>
                    </li>
                  </ul>
                  <p> </p>
                  </td>
                  <td style="vertical-align: top; width: 128px;">
                  <h2><img title="FreeArc's ARC archives"
 alt="ARC extension" src="file-format/file-format.png"
 style="width: 96px; height: 96px;" align="right"></h2>
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            <div style="text-align: left; color: rgb(0, 0, 0);"><big> </big>
            <h2><big><big><big><a name="arc_specifications"></a><a
 href="#.arc_extension">What are ARC files, FreeArc archive format</a></big><big><br>
            </big></big></big></h2>
            <br>
            </div>
            <a name="what_is_arc_file"></a><span
 style="font-weight: bold;">ARC</span> extension designates the native
archive format developed for&nbsp; <a href="http://freearc.org/">FreeArc<img
 alt="what is .arc file" title="ARC file format specifications"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>, a modern
open source file archiver created by Bulat Ziganshin, featuring high
level of compression (11 lossless data compression algorithms and
filtes are supported, including LZMA and PPMD) with good efficiency (<a
 href="http://www.tomshardware.com/reviews/archive-zip-compression,2572-6.html">Tom's
Hardware comparative<img alt="arc vs rar vs 7z benchmark"
 title="ARC format performances" src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>)
comparable or better than <a href="what-is-rar-file.html">rar format</a>
and in many cases also of <a href="7z-file-format.html">7z format</a>,
            <a href="encrypt-files.html">strong
encryption</a> (<span style="font-weight: bold;">AES</span>, <span
 style="font-weight: bold;">Blowfish</span>, and AES contest finalist
algorithms <span style="font-weight: bold;">Twofish</span>, and <span
 style="font-weight: bold;">Serpent</span>), and ability to create
recovery records (option which is notably featured by proprietary RAR
format but not by open format 7Z). The file format is also known with <span
 style="font-weight: bold;">WRC</span> extension.<br>
            <br>
            <h2 style="font-weight: bold;">Maximum size of ARC file
format<br>
            </h2>
            <a name="max_size_of_arc_file"></a>The max size of ARC
files is 2^63 bytes (8 exabytes of
total size of the archive), filesize field represented by a signed 64
bit integer, exceeding current needs and
limitations of common filesystems.<br>
            <br>
            <h2 style="font-weight: bold;">Maximum number of files in a
single ARC archive</h2>
            <a name="max_files_numbers_arc_format"></a>The maximum
number of input files allowed into a singe ARC package is limited to
2^31 (max 2 billion files), file number filed represented by a signed
32
bit integer, which - like maximum archive size limit - practically
exceeds current needs.<br>
            <table style="width: 100%; text-align: left;" border="0"
 cellpadding="24" cellspacing="0">
              <tbody>
                <tr>
                  <td
 style="text-align: right; vertical-align: middle; width: 64px;">
                  <h2><span style="font-weight: bold;"><img
 title="What is ARC file format, native FreeArc archives extension"
 alt="freearc arc format features" src="file-format/information.png"
 style="width: 48px; height: 48px;"><br>
                  </span></h2>
                  </td>
                  <td
 style="font-style: italic; vertical-align: middle;"><span
 style="font-style: italic;"><a name="arc_file_type"></a>FreeArc's
format must not be
confused
with 1985 </span><a style="font-style: italic;"
 href="https://en.wikipedia.org/wiki/ARC_%28file_format%29">SEA's ARC
format<img alt=".arc file definition" title="SEA ARC file format"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a><span
 style="font-style: italic;">, using same .arc file extension. The
company pionereed the data
compression in BBS era, but ARC program fell in popularity after the
introduction of more efficient Phil Katz's PKARC, which later developed
largely modified and improved ZIP format for PKZIP program, in response
to the notorious lawsuit ensued between SEA and PKWARE.</span></td>
                </tr>
              </tbody>
            </table>
            <span style="font-style: italic;"></span>PeaZip features <a
 href="arc-files-utility.html">creation and
extraction of ARC files</a>: create, open, browse, and extract ARC
archives, convert any supported archive to .arc format and vice-versa.
Also, the application supports creation of arc-format <a
 href="self-extracting-archives.html">self extracting
archives</a> (<span style="font-weight: bold;">SFX</span>), so
recipient
will not need a FreeArc compatible extractor when receiving one of
those self-extracting files.<br>
PeaZip currently does not support reading, nor writing, the unrelated
SEA's ARC format.<br>
            <h2><img title="ARC file format features"
 alt="what are arc files" src="add-to-archive.png"
 style="width: 100px; height: 45px;"></h2>
            <h3><img title="ARC format specifications"
 alt="arc format compression encryption features"
 src="extract-archive.png" style="width: 112px; height: 45px;"></h3>
            <br>
            <a name="arc_file_format_specifications"></a>Read more .arc
file type <span style="text-decoration: underline;"></span><a
 href="https://en.wikipedia.org/wiki/FreeArc">FreeArc Wikipedia entry<img
 title="Wikipedia FreeArc" alt="FreeArc software"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px; font-weight: bold;"></a>,
            <a target="_blank"
 href="http://en.wikipedia.org/wiki/Prediction_by_partial_matching">PPMd<img
 title="PPM algorithm" alt="Wikipedia prediction by partial matching"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a> and <a
 target="_blank"
 href="http://en.wikipedia.org/wiki/Lempel%E2%80%93Ziv%E2%80%93Markov_chain_algorithm">LZMA/LZMA2<img
 alt="Lempel Ziv Markov chain algorithm" src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a> data
compression algorithms, <a target="_blank"
 href="http://en.wikipedia.org/wiki/Advanced_Encryption_Standard">AES<img
 title="Rijndael" alt="wikipedia aes algorithm"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>, <a
 target="_blank" href="https://www.schneier.com/twofish.html">Twofish<img
 title="Bruce Schneier" alt="twofish algorithm"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>, <a
 target="_blank"
 href="http://en.wikipedia.org/wiki/Serpent_%28cipher%29">Serpent<img
 title="Ross Anderson, Eli Biham, Lars Knudsen" alt="Serpent algorithm"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a> ciphers.<br>
            <br>
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 style="background-color: rgb(72, 136, 248); width: 100%; text-align: left;"
 border="0" cellpadding="0" cellspacing="1">
              <tbody>
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                        <td style="vertical-align: top; width: 24px;">&nbsp;&nbsp;
                        <br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;">&nbsp;&nbsp;
                        <br>
                        </td>
                      </tr>
                      <tr>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td
 style="vertical-align: top; color: rgb(245, 245, 245); width: 430px;">
                        <table style="width: 100%; text-align: left;"
 border="0" cellpadding="0" cellspacing="0">
                          <tbody>
                            <tr>
                              <td
 style="width: 50%; color: rgb(245, 245, 245); vertical-align: middle;">
                              <h3><big><big><big><big><big><a
 name="arc_format_specifications"></a>.ARC</big></big></big></big></big></h3>
                              </td>
                              <td
 style="width: 50%; color: rgb(245, 245, 245); vertical-align: middle;">Author
Bulat Ziganshin, 2007<br>
8 EB max total archive size limit<br>
2 billions files limit in a single archive<br>
                              </td>
                            </tr>
                          </tbody>
                        </table>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td
 style="vertical-align: top; color: rgb(245, 245, 245); width: 430px;">
                        <h4><big>SPEED <img alt="arc format specs"
 title="arc compression speed" src="zip-files/star4.png"
 style="width: 80px; height: 16px;"></big></h4>
Arc format features good speed. Very efficient implementation makes it
significantly faster than
7Z
compression and extraction (and marginally faster than RAR), with
comparable compression ratio.<br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                      </tr>
                      <tr>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                      </tr>
                      <tr>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td
 style="vertical-align: top; color: rgb(245, 245, 245); width: 430px;">
                        <h4><big>COMPRESSION
RATIO <img alt="arc format specifications"
 title=".ARC compression performances" src="zip-files/star4p5.png"
 style="width: 80px; height: 16px;"></big></h4>
Arc archives features very good compression ratio. Comparable to 7-Zip
with LZMA / LZMA2 compression,
consistently better than
RAR format, but inferior
to PAQ compressors family.</td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td
 style="vertical-align: top; color: rgb(245, 245, 245); width: 430px;">
                        <h4><big>ADVANCED
OPTIONS <img alt="arc format aes sperpent tworfish encryption"
 title="ARC format options" src="zip-files/star4p5.png"
 style="width: 80px; height: 16px;"></big></h4>
Arc format features a very good selection of advanced functions.
Built-in support for AES, Twofish and Serpent encryption,
and optional creation of recovery records - ARC is one of the few file
types alongside RAR providing error recovery feature.<br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                      </tr>
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                  <td
 style="vertical-align: top; background-color: rgb(240, 239, 238);"><small><a
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                  <td
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ARCHIVES</a></small></td>
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            <br>
            <p> </p>
            <p><a href="peazip-help-faq.html">FAQ</a>
&gt; Archive file types &gt; What are arc files</p>
Topics about FreeArc's ARC extension, what is ARC file format,
specifications, what are ARC format features (lzma, ppmd compression
and aes, setpent, twofish encryption), characteristics, max size and
input file number limitations, advantages and disadvantages compared to
other archive types:
            <table style="width: 100%; text-align: left;" border="0"
 cellpadding="6" cellspacing="0">
              <tbody>
                <tr>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;"> what is
arc file format,<br>
features of arc format,<br>
sea arc
format,<br>
format features and specifications,<br>
                  <h4>what are LZMA, PPMD compression algorithms,</h4>
maximum size of ARC file,<br>
                  </td>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;"> FreeArc
archives
specifications,<br>
arc file type faq<br>
arc format features,<br>
max number of file in ARC archive,<br>
native FreeArc archives extension,<br>
AES, Blowfish, Twofish, Serpent encryption
algorithms, </td>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;">faq
about .arc extension,<br>
arc specs,<br>
ARC format specifications,<br>
characteristics of arc files,<br>
arc file format features,<br>
                  <h4>what is AES encryption,</h4>
                  <h4>what is Twofish encryption,</h4>
                  </td>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;">what are
wrc files,<br>
what are arc files,<br>
advantages of .arc format,<br>
max size limit for ARC format,<br>
freearc software,<br>
                  <h4>what is Serpent encryption,</h4>
encrypted FreeArc archives<br>
                  </td>
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            <td style="vertical-align: top;">Tag Cloud <br>
            <span class="wrd free-rar0" id="arc-file-encryption-aes"> <a
 href="arc-file-format.html">AES encrypted archive</a></span> <span
 class="wrd free-rar4" id="arc-extension"> <a
 href="arc-file-format.html">ARC</a></span> <span class="wrd free-rar0"
 id="arc-file-encryption-blowfish"> <a href="arc-file-format.html">Blowfish
algorithm</a></span> <span class="wrd free-rar2"
 id="free-arc-files-utility"> <a href="arc-files-utility.html">free
ARC files
utility</a></span> <span class="wrd free-rar1" id="arc-file-format"> <a
 href="arc-file-format.html">FreeArc ARC format</a></span> <span
 class="wrd free-rar0" id="arc-files"> <a href="arc-file-format.html">SEA
ARC files</a></span> <span class="wrd free-rar1"
 id="arc-file-encryption-serpent"> <a href="arc-file-format.html">Serpent
cipher</a></span> <span class="wrd free-rar0"
 id="arc-file-encryption-twofish"> <a href="arc-file-format.html">Twofish
encryption algorithm</a></span><br>
            <span class="wrd free-rar2" id="what-is-arc-format"> <a
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file format</a></span> <span class="wrd free-rar3" id="wrc-extension">
            <a href="arc-file-format.html">WRC file extension</a></span>
            <span class="wrd free-rar2" id="7-zip-archives"> <a
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to
separate archives</a></span> <span class="wrd free-rar2"
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 href="how-to-open-rar-tar-zip-files.html">how to open arc rar zip files</a></span>
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file</a></span><br>
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file archiver</a></span> <span class="wrd free-rar3"
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extraction</a></span> <span class="wrd free-rar2"
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ZIP format</a></span> <span class="wrd free-rar1"
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archiver utility</a></span> <span class="wrd free-rar0"
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extractor</a></span> <br>
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compression benchmark</a></span> <span class="wrd free-rar1"
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performances</a></span> <br>
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features</a></span> <span class="wrd free-rar1"
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format comparison</a></span> <span class="wrd free-rar4"
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utility</a></span> <span class="wrd free-rar0"
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extractor</a></span> <span class="wrd free-rar0"
 id="best-file-compression-standard"> <a
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format</a></span> <br>
            <span class="wrd free-rar2"
 id="max-size-limitation-7z-arc-rar-zip-file-format"> <a
 href="rar-zip-file-format-size-limitations.html">max size limit for 7z
arc rar zip files</a></span><br>
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